Apparatus for grading material



Aug. 1, 1933. D. D. DUNKIN APPARATUS FOR GRADING MATERIAL Filed March 30, 1929 2 Sheets-Sheet 1 H T'UAH W gn uq/vvtoo Dam on D. Dunk/n.

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Aug. 1, 1933. D. D. DUNKIN APPARATUS FOR GRADING MATERIAL Filed March so, 1929 2 Sheets-Sheet 2 gwwz/WWL Damon D. Dunk/n Patented Aug. 1, 1933. v I 1,92%,190'

err srATss PATEN FFECE 1,920,190 APPARATUS F03 GRADING MATERIAL Damon D. Dunkin, Guion, Ark. I Application Mal-ch30, 1929. Serial No. 351,208

5 Claims. (Cl. 209.-120) The present invention relates to an improved Fig. 3 is an enlarged detail sectional View of method and apparatus for grading materials the lower portion of the feed hopper, and and is designed primarily for the grading of a Fig. l is a detail elevation showing the driving relatively fine material, such for example as means for the cleaning brush. sand, although it is not necessarily restricted to Referring now more in detail to the accom- 60.

such use, i I panying drawings, the numeral designates in An important object of the invention is to its entirety asuitable supporting framework of provide apparatus wherein the sand or other any conventional or preferred construction and material to be graded may be quickly and effiwhich is adapt pp the various Darts 0 ciently separated into a plurality of different of the grading apparatus or machine as will be 5 grades, each grade containing grains of arelamore clearly hereinafter apparent. Carried by tively predetermined size, the supporting framework, and more, particu- Another object of the invention is to provide larly by the spaced horizontal beams 11 and 12, such apparatus wherein the sand or othermae a ned b a s 3 and 14 Within Which is 0 terial to be graded is deposited upon a traveling journals-d the horizontal shaft 15 having mountsurface moving in a circular path, the moveed tncreuponthe drum 16. The drum 16, is ment of said surface being such that a plurality preferably Composed of a piuralityof spaced meof different relatively predetermined grades of tallic spiders 17 carrying the wooden cylinder or material will be successively discharged therelagging '18 to which is secured the covering 19 '20 from at spaced points or intervals in its travel. 01 canvas or any other suitable material. The

' size.

Anotherohject of the invention is to provide drum 16 is adapted to rotate i th direction such apparatus wherein the sand or other mai d w by-t a O i Fi l a m y b terial to be graded is, discharged, in ;a mixed driven by means of a pull y 20 k yed to ne nd product, onto a drum rotatable preferably about of shaft 15and about which is trained a belt 21.

5 a substantially horizontal axis, said drum being Mounted above the drum 16, upon the spaced adapted, upon rotation thereof, to effect the horizontal beams 22 and 23 of the 'suppOrt separation of a plurality of different grades of a wo is t d M bOX 24 P material from the mixed product, each grade vided with an outlet slot 25 in the bottom therecontaining grains of a relatively predetermined of which extends substantially the entire length v oi the drum so that the sand or other material A further object of the invention is the protobe, graded will be discharged onto the drum visionof means for receiving the coarse grade in the form of a ribbon. The feed hopper is of material separated from the mixed product preferably so positioned that the material will and directing the same to a desired loc'ation,' be fed onto the drum just back of the vertical 35 said means being adjustable to vary the grain center thereof. Carried by the feedhopper and size of the coarse grade of material. positioned beneath the outlet slot 25 are the Still another object of the invention is the horizontally spaced rollers 26 and 27 journaled provision of means for receiving a portion of at their opposite ends in bearing blocks 28 the in terial separated from the mixed product mounted for horizontal sliding movement with- 4d and eiiecting a further separation thereof to in guideways 29. The feed rollers may be adproduce the second and third grades, said means just-ed toward and away from one another by being adjustableto maintain the second grade means of the hand wheels 30 to vary the Sp ce practically constant. therebetween. While the rollers are ordinarily Other objects andadvantages of the invention maintained stationary during the feeding of the 45 will become more apparent during the course of material therebetween, either one or both of the following description when taken in connecthem may be rotated by means of hand wheel tionwith the accompanying drawings. 31 carried by the shaft thereof. Thus, in case In the drawings-forming a part of this appliof obstructions between the rollers, such as may cation and wherein like numerals are employed be caused by sticks and the like, a turn of one Q 50 to designate like parts throughout the same, or both rollers will serve to remove this obstruc- Fig. l is a front elevation, partially broken tion and free the material. away, of grading apparatus provided by the pres- Arranged beneath the drum 16 and extending ent invention. throughout the length thereof is a relatively Fig. 2 is a vertical transverse section taken large binor receptacle divided into a plurality 55 substantially on line 2-2 of Fig. 1. of individual compartments or catch boxes 32, 33.

per minute operates very satisfactorily.

34, and 36. These compartments, which are of varying sizes, may be provided with outlet spouts or the like 37 to 41 respectively for conveying the material therefrom to any desired location. The individual compartments 32 to 36 inclusive are formed by the provision of spaced vertical partition walls 42, 43, 44 and 45. The

partition walls 42, 43 and 44 are of substantially rality of different relatively predetermined grades of material will be successively discharged therefrom at spaced pointsor intervals in its travel. The coarser grains will naturally be first thrown or discharged from the drum by the centrifugal force created thereby and then the progressively finer grains. While the size of the drum and also the speed of rotation thereof may be varied, dependent upon the character of the sand or other material to be graded, it has been found that a drum thirty inches in diameter and rotating at a speed of thirty revolutions speed of rotation of the drum is an important factor. A too high rateof speed gives a throwing action which causes the discharge of too much dust and fine grains of material with the coarser grains While too slow a speed fails to keep the mass of material agitated and alive; With correct speed, the material is properly agi tated and kept alive so as to allow the fine grains to sink through the coarsergrains and become enmeshed in the fabric covering of the drum, while, at the same time, the larger or coarser grains work through and to the top of the mass.

Upon rotation of the drum 16, there is a constant movement of the grains of material thereon'and the coarser grains working to the top will be the first discharged therefrom by the centrifugal force created thereby. The coarser grains initially thrown from the drum are des-- ignated 46 and this materialis caught upon an inclined deflector plate 47 and directed thereby into the first compartment or catch box 32 forming the first finished grade or product. The defiector plate is pivotally mounted so that the upper end thereof may be swung upwardly and outwardly or downwardly and inwardly to vary and control the grain sizes in the coarser grade of material.. That is, by moving'the deflector plate to the right so-as to lower the upper end thereof and bring it closer to the drum, a somewhat finer grade of .material will be caught thereby whereas, on the other hand, if the plate be moved to the left to raise the upper end, only the coarser grains of material or those thrown furtherest outwardly by the drum will be caught thereby. V

The deflector plate 4'1 is carried by a shaft 48 rotatably supported at its opposite ends by the vertical legs 49 and 50 of the supporting framework 10. .Secured to the underside of the defiector plate, adjacent each end thereof, is a segment 51 provided with gear teeth 52. Also carried by the supporting framework 10 and positionedin line with shaft 48 is a second shaft In other words, upon rotation of the drum, a plu-.

The

the desired angle with respect to drum 16.

The relatively finer material next discharged from the drum is indicated at 57 and falls downwardly onto the horizontal platform or regulator plate 58 provided with the upstanding end walls 59, The material 57 is allowed to pile up on the regulator plate as at 60 and when the pile is built up to the angle of slide, the material 57 falling from the drum will be further separated, a portion thereof being directed into the compartment 33 and a portion into compartment 34. The material 61 received withincompartment 33 forms'the second finished grade or product while the material 62 received within compartment 34 constitutes the third grade. There is also mixed with the third grade of material 62 those relatively finer grains 57 discharged from the drum directly into compartment 34.

According to this invention, the third grade of material 62 is preferably returned to the machine for regrading, this being desirable since it ordinarily contains some material that belongs in .the second grade and also an excess of fine material. The original sand fed to the grader will vary according to the location from which obtained and therefore, the regulator plate 58 is preferably movable horizontally so that as the .sand varies, the position of said plate may be chine for regrading. If it is found that the sand grains change in the feed and the second grade shows too many fine grains, the regulator plate is moved to the left so that more of the material 57 falls into compartment 34 while, on the other hand, if the sand is coarser, then the regulator plate is moved to the right so that more of the material will fall into compartment 33.

The regulator plate 58 may be supported at its opposite ends upon wheels 63 mounted upon rails 64 carried by the supporting framework 10. Secured to the bottom of the regulator plate adjacent each end thereof is a rack bar 65 engageable by a gear 66 keyed to shaft 6'7, said shaft being operable by a hand wheel or the like 68. Upon rotation of shaft 67 and gears 66, regulator plate 58 may be moved horizontally to the left or right as desired. By properly controlling the position of this plate, the amount of fine material going into the second grade can be controlled to very close limits.

The still finer grains of material indicated at 69 are next discharged from the drum and are received within'the compartment 35 forming the fourth grade or product while the very finest grains or dust adhering to the fabric covering of the drum may be removed therefrom by means of the rotatable brush '70, this dust being designated 71 and received within compartment 36. The brush 70 is preferably mounted upon a shaft 72 carrying at one end thereof a sprocket 73 about which is trained sprocket chain '74 to effect the desired rotation of said brush.

It is to be understood that the form of'the invention herewith shown and described is to be taken as the preferred embodiment of the same, and that various changes in the shape, size and arrangement of parts may be resorted to Without departing from the spirit of the invention or the scope of the subjoined claims.

I claim: I

1. In apparatus for grading sand and like materials, a drum for receiving the material to be graded thereon, means for rotating the drum about a substantially horizontal axis to eifect the successive discharge therefrom of a plurality of different grades of material, each containing grains of a relatively predetermined size, a horizontally disposed platform for receiving a portion of the material discharged from thedrum and effecting a further separation. thereof to produce the second and third grades, and means for moving said platform horizontally to control the amount of material passing into the said second and third. grades.

2. In apparatus for grading sand and like materials, means for receiving the material to be.

graded, means for rotating the first named means in a circular path about a substantially horizontal axis to eifect the successive discharge therefrom of a plurality of different grades of material, each containing grains of a relatively predetermined size, horizontally disposed means for receiving a portion of the material discharged irom the first mentioned means and effecting a further separation thereof to produce the second and third grades, and means for moving said last named means horizontally to control the amount of material passing into the said second and third grades.

3. In apparatus for grading sand and like materials, a drum for receiviir the material to be graded thereon, means for rotating the drum about a substantially horizontal axis to effect the successive discharge therefrom of a plurality of different grades of material, each containing grains of a relatively predetermined size, means therefrom of a plurality of different grades of material, each containing grains of a relatively predetermined size, a deflector plate mounted in proximity to the first mentioned means for receiving the coarse grade of material discharged therefrom and directing it to a desired location, means for adjusting the deflector plate to vary the grain size or" the coarse grade of material, horizontally disposed means for receiving a portion of the material discharged from the first mentioned means and effecting a further separation thereof to produce the second and third grades, and means for moving said last named means horizontally to control the amount of material passing into said second and third grades.

5. In apparatus for grading sand and like materials, a drum for receiving the material to be graded thereon, means for rotating the drum about a substantially horizontal axis to effect the successive discharge therefrom of a plurality of different grades of material, each containing grains of a relatively predetermined size, an inciined deflector plate mounted in proximity to the first mentioned means for receiving the coarse grade of material discharged therefrom and directing it to a desired location, means for rocking the deflector plate to move it closer to or further away from said drum whereby to vary the grain sizes of the coarse grade of material, means for receiving a portion of the material discharged from the drum and effecting a further separation thereof to produce the second and third grades, and means for moving said mentioned means horizontally to control the amount of material passing into the second and third grades.

DAMON D. DUNKIN. 

